does this have similarities to OG Mon Paris? Both in scent and longevity.

Yes! It smells like the original Mon Paris a scent that's close to my heart. But as the name suggests this new version is more intense. I love the original it's my go-to for work and during the day but I also love this perfume for dates and nights out. For that extra kick at night I turn to the new version. I hope this helps! ~ Meg